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In the world of gemstones, accurate identification is crucial for both consumers and jewelers. Moissanite, a popular diamond alternative, has been the subject of much curiosity in recent years. A common question we receive at Nazar’s & Co. Jewelers is whether moissanite can pass a diamond tester. In this blog post, we’ll dive into the world of moissanite and diamond testers to discover if this gemstone can truly pass as a diamond.

Background Information:

Moissanite, a gemstone first discovered in 1893 by French chemist Henri Moissan, has gained popularity for its durability, brilliance, and affordability. Composed of silicon carbide, moissanite closely resembles a diamond in appearance and hardness, making it an attractive option for jewelry.

Diamond testers are instruments designed to differentiate between diamonds and other gemstones. There are several types of diamond testers, including thermal conductivity testers, electrical conductivity testers, refractive index testers, and combination testers. Each type works on a different principle to distinguish diamonds from other materials.

Moissanite and Diamond Testers:

To determine if moissanite can pass a diamond tester, we must analyze its reaction to each type of testing method.

  1. Thermal conductivity testers: These testers measure a gemstone’s ability to conduct heat. Since moissanite has a different thermal conductivity than diamonds, it generally does not pass this type of diamond tester.
  2. Electrical conductivity testers: These testers evaluate a gemstone’s capacity to conduct electricity. Moissanite, unlike diamonds, exhibits electrical conductivity. As a result, moissanite can often be distinguished from diamonds using this type of tester.
  3. Refractive index testers: These testers measure the degree to which light is bent, or refracted, as it passes through a gemstone. Moissanite has a higher refractive index than diamonds, so this testing method can effectively differentiate between the two gemstones.
  4. Combination testers: These testers utilize multiple testing methods to provide a more accurate identification. Moissanite typically does not pass combination testers, as they take into account both thermal and electrical conductivity, as well as refractive index.

Factors Affecting Test Results:

The accuracy of a diamond tester can be influenced by several factors:

  1. Quality and calibration of diamond testers: High-quality, well-calibrated testers are more likely to provide accurate results. Regular calibration and proper maintenance of a tester are essential for optimal performance.
  2. Environmental factors and testing conditions: Temperature, humidity, and the cleanliness of the gemstone’s surface can all affect the test results. Following the manufacturer’s guidelines and testing in a controlled environment can help improve accuracy.
  3. Potential for false positives or negatives: No testing method is infallible, and there may be instances where a tester produces a false positive or negative result. In such cases, further testing or consultation with a gemologist may be necessary.


While moissanite may pass some types of diamond testers, it generally does not pass combination testers, which offer a more accurate identification. At Nazar’s & Co. Jewelers, we understand the importance of accurate gemstone identification for our customers. If you’re interested in purchasing a diamond or moissanite piece, our knowledgeable staff can guide you through the selection process and help you find the perfect gemstone for your needs. Visit our store today to explore our exquisite collection of diamonds, moissanites, and other fine gemstones.


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